Cleaning aluminum in electronics assemblies
Specific challenges with aluminum
Aluminum forms a protective oxide layer that can be attacked by strong alkalis and acids. Aluminum surfaces can also trap flux residues under micro-porosity. Special attention is required because aluminum is common in heat sinks and housings.
Best practices for cleaning
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use neutral pH or mildly alkaline detergents with corrosion inhibitors;
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avoid chelants that aggressively complex aluminum unless passivators are included;
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rinse thoroughly with DI water and dry to prevent pitting;
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conduct coupon testing with assembled materials.
ZESTRON offers aluminum-safe formulations and process parameters for assemblies containing heat sinks and housings.